Ruf Automobile GmbH is a German car manufacturer that manufactures and engineers original vehicles using unmarked Porsche chassis, specifically known as bodies in white. The cars are built from the ground up as completely new cars, using these bare chassis, and assembled using Ruf-made parts and materials, instead of badge engineering or disassembly of existing cars. This means the company is officially recognized as a manufacturer by the German government. As such, all Ruf models have certified Ruf VIN and serial numbers, and are recognized as production models, rather than modified Porsches. Ruf is historically known for its record breaking 211 mph CTR, and is the largest, most renowned company to make Porsche performance enhancements. Though primarily a manufacturer, Ruf has also made a name for itself operating as a car tuner, a specialist in customer-requested Porsche-to-Ruf conversions, and a restorer of classic Porsche and Ruf models. Ruf carries out service and crash repair, as well.